Perform a delamination survey on a parking structure slab using chain-drag/sounding methods adapted from ASTM D4580

Steps

1. Note that ASTM D4580 is titled and scoped for concrete bridge decks — when applying its chain-drag/sounding procedures to a parking structure slab, document this as an adapted-practice application rather than citing it as a garage-specific standard.
2. Establish a survey grid across the slab area and drag a multi-link chain (or use hammer/steel-rod tapping per the standard's alternate procedure) across the surface, listening for the dull/hollow sound indicating a subsurface delamination.
3. Mark and map all identified delaminated areas on a plan for use in scoping patch-repair boundaries.
4. Cross-check chain-drag findings against half-cell potential (ASTM C876) results and any GPR/impact-echo scanning data to corroborate delaminated zones before finalizing repair quantities.
5. Account for practical limitations noted in the standard/field practice: chain drag is generally more precise than electromagnetic sounding devices for locating delaminations, but ambient noise and topping slabs/toppings can affect sound interpretation.